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Equity - Additional Information (Detail) - Kronos Worldwide, Inc. $ in Millions	3 Months Ended
	Jun. 30, 2019 USD ($) shares
Equity Class Of Treasury Stock [Line Items]
Common stock, Repurchased	110,000
Stock repurchase, aggregate purchase price | $	$ 1.4
Shares available for purchase	1,800,000

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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